Dynamo-electric machine.



"UNITED s'rn'rns PATENT ounion.

EDWIN c. WRIGHT, OF n-nwron'rfxnu'ruonir, iissien'on To THE BUIiLOCKELECTRIC MANUFACTURING comr mv, A CORPORATION von 01-110.

DYNAMO-ELECTRIG MACHINE.

Specification of Letters Patent.

Patented Feb. 15,1910.

Application filed January 22, 1906. Serial No. 297,137.

To all whom it may concern:

Be it known that I, EDWIN G.-VVnIe cr, citizen of the United States,residing at l lewport, in the county of Campbell and State of Kentucky,have invented certain new and useful Improvements in Dynamo- ElectrioMachines, of which the following is a full, clear, and exactspecification.

My invention relates to dynamo-electric machines having auxiliary fieldwindings for armature self induction in which case it is treuuentlycalled a compensating winding, or the auxiliary winding may be orinngcdon nuxilinry field poles intermediate the main field pole, for thepurpose of erecting cominutnting fields for the coils shortcircuited bythe brushes, windings so dis posed being known as F connnutating windings. In either case the auxiliary winding should carry currentproportionate to the current in the armature Winding, and it [hasheretofore been customary to connect ,to space them far apart.

such windings in series with the armature windings. In machines designedtor gem crating heavy currents, this arrangement ot the auxiliarywinding in series with the winding is arranged on field poles forproviding coinn'iutoti'ng fields few turns will i be necessary andfrequently fractions of turns having a heavy'current flowingtherethrough will provide the proper ampereturns. It ,is thereforedifficult "ndcrthese.

i l l l circumstances to obtain exactly the proper commututing effect. c

The olnect of my invention is to provide on uuxiliery field windingwhich will have u relatively large number 0': turns of u condoctor whichis comparatively easy to wind and which will carry a current smallerthan the armature current but proportionate thereto. 7

in carrying out my invention, 1 connect :the auxiliary field winding inshunt to the armature circuit, and provide automatic means for varyingthecurrent in this auxiliary winding in proportion to variations in the:irn'inture current.

More specifically considered my invention consists in iidyi'uuno-electric machine huvin on armature winding, :1 main fieldwincling and auxiliary field winding, which uuhiliury field winding isin shunt to the m niature winding and has in its circuit a variableresistance; I provide a solenoid.

having its coil in serieswit-h the armature circuit and having" tmovable plunger and lover urranged to-cut in and out more or less of theresistance in circuit with the auxlhury winding to very the'currenttherein in proportion to variations of current in the arms-*- turewinding. With this arrangement the current in the auxiliary winding maybe as small as desired end a large number of conductors can he'employedto obtain the proper ampere-turns For u better understanding ofmy invention, reference is had to the occompr-mying drmvings in whicl1-Figure 1. is 2 conventional representntion of e dynamo-electric machineembodying my invention, the auxiliary field winding being in this caseit commutating winding, the coils of which are arranged intermediate themain field coils; Fig. 2 is a diagrammatic view showing. the variouswindings and their connections; and Fig. 3 is a modification of thedevice employed for vary ing the current through winding.

Referring now to the figures of the drawing, 16 represents the armatureshaft on which are mounted the armature 1i and commutator 12. Brushes 13are connected to the main armature terminals 14 and 15.

the auxiliary field The field frame 16 has inwardly projecting windingis ulro arranged in Flilllll to tho to muturc circuit. connectionsthcrclo huiugr inudc :-:l' 131 und ln circuit with lh uuxiliary windingis u \nulihlc lQBlil Zlllfl h; lug contacts :rl uduptcd to in: cngugcdor tlll. rhcostat arm 25.

In ordcr thu' tl field winch inn 1c m j, always hc lll'Oil-tll'lltllllilto the current in the urinuturc circuit, l vidc uutomutic nicunsrcspomivc lo-rhn igr: in current of he armature circuit. for l' jf'llhiding the amount of resistance in tho uuxiliary licld circuit. Forthis purpose l providc a solenoid, the coil 26 0:" which is in serieswith the armature circuit und the plunger core 27 of which conncctcd bya lint 28 to the rheostut arm 25. thr current. varies in the solcuoil'lcoil, tho pluir get will be ruiscd or lowr-rcd, moving tho rhcostut armin a rloclrwisc or coontor-cloclo wise direction.

It is evident that moans inustxhc providcd for obtaining approxiinutclvcouul inovcncnts; of the plungcr '27 and rhcostui urln 2;)

for equal incrciucnts of current. fl'his l'rhull follows if the mug-not;pull on tho col. varies as the current in tho coil for dill'crcutPCSllIlORQ of the core, and it' the corc is strained by n forcc. whichtornll the opcrrttive positions of the core. hours 2 liitcd lotion tothe magnetic pull and varies proportionately therewith.

in Figs. 1, and 3, means arc shown whereby the current in the auxiliarywindingis caused to vary proportionately to \uriutions in the urinuturc'current. Br 1 pcriinent it is found that tho nntgnc on ti solenoid core,hctw positions of tho core. s stunt with :1. given currt the core iskept within the tions throu iout its worl...u rurr magnetic pi on thecore is uppro n null proportional to the current in the coil rc gurdlessof the position of the cow; ln Figs. 1 and I have shown :1 spring ill"tor constraining the moven'icnt of the i'hcostut urm und plunger, whichspring attached zit one cud to a stationary support 30 and .1 o'thcr cudto on extension 31 oithe rhcostal arm 25. The resistance contacts illare arranged closcly together so thut t" rhcosuturm moves throu 'h :1co. ti 'ciy small angle in passing l'l'Olll. its lm' crst to its highestposition. The points ol utruchnient of thc sprin and the pivot of costutin .1 straight line n lrwcr- 'illtl most position.

currcnt, in tho nuxiliuux'.

i ct-utcr of I during the small angular movement of lllk point ofattachment to tho cxtcnsiou ill j from a vertical line drawn through thecon tcr of the pivot. of the rhcostuli urui, and

certain limitino;

, Willlllll! this distuncc ratios with the position of tho pluugcr.lflquilibrium is obtuinod whcu lhr coro rruchcs such u. position thatthc l orcm :xrc' rouul. lloncc it follows that for equal inrrcmrnts oicurrcnl' there are cqunl Yortiral iuovrmcnts ot the plunger and gquuluugulur inox'clucnts of thc rhcostut urlu, and hence the current in theuuxiliury sl nut winding rut-ices proywrtionutcly to vuriution ol thecurrrnt in tho urniulurc.

ln Fi 3, i hnvc shown :1. modification ol' tho rcguluting lucuns..lnstcud of the s n-lily: 2i), tilu is shown zrwcight 32 on u hrll cranklcrcr 3=l, tho rhcoslut nriu 2 5 torn; ing ono' urn's of tho lcvor. Theposition ol the lover, whcn thcrc no current in tin coil, is such thut'l'hc ccnicr or gl'urilf.

l. in a vcrtiiul lino drawn through tho crntrr olthc pivot. of thclcvcr. 'lho turning moincut, for at small angular movement ol 1hr lcwr,dcpcnds, :r iproximutrly, on tho di tunco of tho conic ol' grzn'ity fromthr wrticnl lint: druwn through the cculrr of th pivot, and this dcpmul:on the position ol' the plungcr. llcnuc the wci iht llhf: llu' springlimits to a proper amount thc vorticul nlorcnu-nts of the plunger forcquul incrcl'iu-nls of current.

in Fig. 2 l have shown u urinhlc rcistuucc in the nnlin liold circuit.for varying the current thcrcin. It is to hr undcrc-tood that l may huvcin the uuxiliury licld circuit, a manually udjusluhlc rcslslunrc, inaddition to the automatically udiustuhc rcoistuncc Q3] i do not wish toor confined to the dctuils. .--hown, nor to thc spccific types ot nor tothc cxuct romicctious shown. I aim in my claims to covcr all suchmodifications which do not inrolrc u dcpnrtirc from the Spirit and scopcof my in vcntil n.

ll hut I claim on now and drsiro to socurc h llct't-zrs Patent is:

1. In a druamo-clcctric nnichinc, :1 main field winding, an auxiliary,spark-inducing licld winding, said uuxiliury field winding being i;z-xhuni: to tho urinuturo circuit, and menus for automatically varyingthe current in thc uuxiliurv winding substantially in direct proportionto chuugcu in the urinuturc current. v

2. lil u dyruuno-clcotric machine, :1 main field winding, an auxiliary,sparlt-rcduciiur fold winding urrnngcd on poles intermediate the mainfield poles and connected across the iiillllfl' flllfi terminals, andmeans responsive to changes in the armature current for varyinglhecurrent through the spark-reducing whirling.

3. la a dyimine-electric machine main field poles, lield coils thereon,auxiliary field poh intermediate the main field poles, an anti-sparkingWinding coi'lsisling of coils on said auxiliary field poles. said coilsbeing connected in shunt to the armature tor animals, a nd. means forchanging the current in the anti sparlcing Winding substantially indirect proportion to changes. in the armature current.

l. in a dynamo-rlcclrie machine, an armature, a an in lield winding, anauxiliary field winding for reducing sparking at the brushes, saidauxiliary \vii'iding being connected in shunt to the armature winding,and eleclrrw magnetic responsive means for varying the current in saidauxiliary wind in; substantially. in direct pro' iertion to ariationsin. the armature current.

in a dyname-electric machine, an armature, a inain field Winding, anauxiliary field winding "for reducing sparking at the brushes, saidauxiliary winding being connected in slmnt tolhe armature Winding,

and means con'iprising a coil in series with the armature winding forregulating the current. in the auxiliary field winding.

6. In a. dynamo-electric machine, an armature, a main field winding, ana uxiliary field Winding in shunt to the arnniturc winding, andeleetro-niagnctic means comprising a coil in series with the armaturewinding for cl'ianging the current in the auxiliary. field windingsubstantially in direct proportion to changes in the armature current.

7. in a dynainn-electric machine, an arma tare, a main field \w-inding,an auxiliary, anti-sparking :tield winding in shunt to the armatureterminals, a variahle re, :l' circuit with the auxiliary winding. meansnespon; We to changes in the armature *ing the amount of resistancecurrent for an m in the auxiliary field circuit inversely as saidarmature current.

8. in a dynamo-electric machine, an armature Winding, a main fieldWinding, an auxiliary field winding in shunt to the drumture Wind-'1' avariable resistance in circuit with the auxiliary winding, andelectro-magnetie meanscomprising a coil in series with .the armaturewinning :tor varying the amount of resistance in series with the an.field. "winiflin to change the current E the auxiliary held windingsubstantially direct proportion to changes in the armature current. i

f). in a dynamo-electric machine, an arma ture winiilingr, a main fieldwinding, an auxiliary field. winding in shunt to the armature winding,:1 variable resistance in the aux- 'iliary field Winding circuit, asolenoid in series with the armature circuit, and a movable plungercooperating with said solenoid for varying the current in said auxiliarywinding substantially in direct proportion to changes in said armaturewindin it). In a dynamo-electric machine, a shuntconnected anti-sparkingwinding and auto- Inaiie means for varying the current in said Windingsubstantially in direct pi'onortion to the main current.

ll. A dynamo-electric machine. having a sinn1t-connceled eon'nnutatingwinding, and means for automatically varying the ampere turns of saidwinding.

' 12. A dynamo-electric machine having a shuni-connected anli sparlringwinding, and means for auloimitically. adjusting said winding.

l dynan'io-electric machine having a main field winding, and ashunt-connected anti-sparking winding, means for automatically varyingthe ani 'icre turns of the antinparking Winding and means for varyingthe ell'eci' of the main field Winding.

'14. A dynamo-electric machine having main field andcoinn'iutatingwindings,meansto automatically adjusting the effect oisaid in; field windings acting upon the armature coils undcrgoiiu,comn'iutation, of means for energizing eaid compensating windings, andan automatic controlling apparatus govern ing said miergizing means,said apparatusheing responsive to changes in the current tl'rroughtheari'nature circuit of said' machine. 7

H3. The combinat on with a direct-current dynan'm-electric machinehavingcompeneating field windings acting upon the armature (ourundergoing commutation. of a magnet in series with the armature circuit,and means for variably energizing said conr pulsating field windings,controlled through the agency of said magnet),

17. The combination with a direct -current ilynaunrclcctric machinehaving compensatinglield windings acting upon the armature coilsundergoing connnutation. of an erwrgiw ing circuit for saidcon'ipensating windings, distinct from the armature circuit, find meanscontrolled by the variation of current flow in the armature circuit forvarying the current in said energizing circuit.

18. The combination with a direct-cuzwent dynamo-clectric machine havil'g commutating poles facing the armature coils undergoing w'anumtation,of an energizing circuit the lion or current in said energizing cir- I ne v cult, and a solenoid nicludcd in series m the ill) armature circuit,the core of said solenoid I nected otherwise than in series, and meansliving arranged to operate said rheostat. i for varying the current insaid anii-qparhing 1%). A iiynam0-ele0trir machine having a! windingsubstantially. in the same proporniain field winding and an anti-spark1ng 1 tion as though it ware (fOIlllQHiHi in sin-ins. 5 winding,and an automatically operated} In i'csiiingiYnvhereof I afiixmysignature.

rheostat for varying the strength of said 1 in the pres ence of twowitnesses. anti sparking winding substantially in i EDVIN (J. \Yiiiflil'i. direct proportion to the armature current.

20. In a dyininirmiectric machine, a main ARTHUR i Kwxs 10 field\VHHiIfig, an anti-sparkmg \vlndlng con- 1 Witnesses: i FRED J. Kmsm'.

